A Study Based on “Why Bother with Truth” by J. Beilby and D. K. Clark
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A Study Based on \Why Bother with Truth" by J. Beilby and D. K. Clark Edwin Chong March 10, 2002 1 Why this study? Help to resolve personal confusion and conflict about truth and knowledge. • Provide a rational basis for our faith. • Help in understanding contemporary culture and thought. • Help in outreach and evangelism. • Improve understanding of philosophical premises of our own discipline (e.g., engineer- • ing). Help in integration of faith in our discipline. • Provide the foundations for further study on relevant topics; e.g., Christianity and • science, creation vs. evolution, \right for you but not for me." Disclaimer: I am not a philosopher. • These notes are merely a summary of the booklet by Beilby and Clark, with a few • points inserted. Exercise: Are these statements true, and how do you know? 1. If all Norwegians have blue eyes, and I am Norwegian, then I have blue eyes. 2. I exist. 3. The earth is round. 4. Jesus rose from the dead. 5. God loves me. 6. Black is beautiful. 7. The Aryan race is superior. 8. The sun rises in the east. 1 2 Introduction Socrates (470{399 B.C.): • { \The unexamined life is not worth living." { Pursued the truth about unchanging moral principles that lead to good life. Gorgias (Sophist): Nothing exists; or if it does, it can't be understood; or if it can, it • can't be expressed. Skeptical Question: Since we disagree about so many things, do we really know • what we think we know? Skepticism: the doctrine that all knowledge claims are suspect or unsupportable. • This study is a journey through history, examining key people and their philosophical • views on truth and knowledge (epistemology). Each is trying to find truth and overcome skepticism. Their views all have valid points to make, so we must tread very carefully! Introduce characters: Mary, Peter (father), and Paul (son). • Two main philosophical views: modern and postmodern. • No matter what you think of these views when we study them, in some way or other • they form the underpinnings of how each of us approaches life. 3 Modern Skepticism: No Knowledge Without Evi- dence Ren´eDescartes (1596{1650) Set very high standards for what counts as knowledge. • Either we achieve absolute certitude or we give in to skepticism. • Influenced by early developments in science and mathematics, especially geometry. • Descartes distrusted human senses. • Build knowledge based on reason alone: rationalism. • Rationalism: begin with absolutely certain starting point, carefully move to absolutely • certain conclusions. Thought experiment: What happens if I assume that a powerful demon is deceiving • me at every moment? Do I still have knowledge? Even in the worst case, \I'm being deceived. Thus, I'm thinking. Therefore, I exist!" • (Cogito ergo sum.) Descartes thought that he had overcome skepticism. • 2 Snags in Descartes's ideas: Following Descartes's method, Baruch Spinoza (1632{1677) and Gottfried Leibniz • (1646{1716) arrived at different conclusions about reality. Mathematicians discovered competing geometries (based on different starting assump- • tions). Kurt G¨odel(or Goedel) (1906{1978): His incompleteness theorems showed that ax- • iomatic systems that are sufficiently rich to describe interesting aspects of reality also contain \truths" that cannot be proved! Francis Bacon (1561{1626) Attempted to understand scientific method. • Relied on human senses (opposite to rationalism): empiricism. • Bacon thought he had overcome skepticism, because trusting the senses is obviously • reliable. David Hume (1711{1776) Argued that following empiricism rigorously leads to skepticism: To be absolutely • certain, we must limit our belief to what we can actually experience. Hume's famous discussion of causation: We cannot deduce what is cause and what is • effect; we can only experience isolated events. Isaac Newton (1642{1727) As rationalism and empiricism ground toward a negative result, science was enjoying • smashing success, thanks in large part to Newton. Alexander Pope: \Nature and Nature's laws lay hid in night: God said, Let Newton • be! and all was light." Newton's approach was neither purely rational (like Descartes) nor purely empirical • (like Hume); it combined both. The Enlightenment (1700s) Golden age in modernism. • Intellectuals shared a central goal: happiness and liberty gained through social progress • guided by reason. This dream required shaking off the social influence of religious traditions and superstitions from the past (which often led to war). Science emerged as the primary form through which human reason would solve social • dilemmas and create a bright future. More recent implications By late 1800s, science dominated Western culture as the only authority of rationality: • scientism. 3 By early 1900s, emergence of logical positivism: All knowledge should meet the stan- • dards of empirical science. Broad implications in many disciplines. Goal: prove every belief. Logic provides the means to be positive about beliefs. • Focus on language: specify criteria by which we can decide which words have meanings • and which don't. Verification Criterion of Meaning: for a word or sentence to be meaningful, it must • be verifiable by the five senses (empirically). Example: tree has \meaning" but God does not. Therefore \God loves me" doesn't • even get to be called false; it is just meaningless. Evidentialism: For a belief to be knowledge, it must be supported by evidence. • According to evidentialism, everyone has a rational and moral duty to believe only • those claims that are supported by sufficient evidence. Evidentialism, though not a new doctrine, was reinforced by the prominence of science. • Notice that only science produces knowledge that meets the requirements of eviden- • tialism and positivism. If a belief doesn't fit in with well-established scientific beliefs or isn't discovered through • normal scientific practices, then it isn't rational and doesn't count as genuine knowl- edge. Conclusion: Every person ought to be agnostic about religious claims. • Summary: Key ideas in modern skepticism Evidentialism: Every belief must be supported by adequate evidence (otherwise, we lack integrity, even morality!). Positivism: Only assertions that are verifiable by the senses are meaningful. Scientism: Science alone produces rational beliefs. Skeptical Question: Do we really know what we think we know|especially in religion| when our beliefs are not properly based on empirical evidence? Implication: Modern skeptics hold that religious beliefs never clear the very high crossbar that any knowledge must leap to be counted. Example: Peter (father): \Unless believers can give scientific evidence for their private, religious ideas, they really shouldn't believe in God." 4 4 Postmodern Skepticism: No Knowledge, Only Per- spectives If you think modernism is scary, wait till you see postmodernism. Modernism stresses • rationalism, absolutism, and positivism. Postmodernism sees these as wrong-headed! Immanuel Kant (1724{1804) Initially tried to follow Liebniz's rationalism. • After reading David Hume, Kant awoke from a \dogmatic slumber" to create a new • and different epistemology (to overcome skepticism). Kant's approach: both the senses and the mind contribute to human knowledge (recall • Newton's scientific approach; but Kant's is different). Recall Hume's discussion of causation: it's impossible to know that one event causes • another just be observing them. Kant's argument: By observing events, it is possible to know that one causes another, • because causation is a category that is innate to the mind. Categories are principles and concepts that are hard-wired into the mind. • Categories in the mind stand ready to receive and structure the facts of experience, and • experience fills the categories with content. Both elements work together to produce knowledge. Kant's synthesis brilliantly answered Hume's challenge, leading to a revolution in epis- • temology. Kant believed that he had answered skepticism. People generally assumed that the world shapes the contents of the mind, but Kant • said that the structure of the mind shapes our view of the world. This reversal was to have momentous implications! Snags in Kant's ideas: Kant's approach requires distinguishing between reality as it is (theoretical knowledge) • and reality as it appears to be (practical knowledge). Kant was satisfied with practical reason as a guide to living. But this distinction opened a door to deeper skepticism. Why was Kant satisfied with practical reason? Because he believed (naively) that all • human minds are structured in a similar way (i.e., have the same categories), and hence would arrive at the same knowledge, given the same empirical evidence. But what if different people have different categories? In the centuries since Kant, people came to believe that the categories of the human • mind can differ widely from time to time and place to place. Implications on knowledge of God: it is no more than knowledge of the human self, a • human invention based on religious needs and passions. 5 Implications in other disciplines: • { Psychology: God is a psychologically inspired father-image [Sigmund Freud (1856{ 1939)]. { Sociology: God is a concept created by the bourgeois class (financial elite) to hold down the proletariat class (poor and destitute) [Karl Marx (1818{1883)]. \Religion is the opiate of the people." The Postmodern view: The idea of universal mental categories is a vestige of modernity. • Our mental categories are particular and specific, grounded in history, tradition, cul- • ture, and language. Speakers of different native languages view the world through the lens of their own • language. English and Swahili aren't just distinct languages; they're radically different systems of thought. Linguistic turn: fundamental shift in how people look at the source or origin of the • categories or structures by which a person interprets the world. Renounce universal reason and celebrate a smorgasbord of particular forms of logic. • If knowledge means true beliefs about the way things really are, then we have no • knowledge at all! Not only can't we \know" God, we can't even \know" the physical world.